{"id":1531,"date":"2025-04-14T16:26:07","date_gmt":"2025-04-14T08:26:07","guid":{"rendered":"https:\/\/www.ductileironsuppliers.com\/?p=1531"},"modified":"2025-06-03T13:59:18","modified_gmt":"2025-06-03T05:59:18","slug":"what-is-the-c-value-of-ductile-iron-pipe","status":"publish","type":"post","link":"https:\/\/www.ductileironsuppliers.com\/ar\/what-is-the-c-value-of-ductile-iron-pipe.html","title":{"rendered":"\u0645\u0627 \u0647\u064a \u0642\u064a\u0645\u0629 C \u0644\u0623\u0646\u0627\u0628\u064a\u0628 \u062d\u062f\u064a\u062f \u0627\u0644\u062f\u0643\u062a\u0627\u064a\u0644 C"},"content":{"rendered":"<p class=\"\" data-start=\"324\" data-end=\"731\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">In hydraulic engineering, the \u201cC value\u201d refers to the Hazen\u2013Williams roughness coefficient. This dimensionless number is widely used to estimate friction losses (head loss) in water flow calculations, particularly in the Hazen\u2013Williams formula. The C value indicates the efficiency with which water flows through a pipe \u2013 a higher value denotes a smoother interior surface, leading to lower friction losses.<\/p>\n<figure id=\"attachment_1532\" aria-describedby=\"caption-attachment-1532\" style=\"width: 848px\" class=\"wp-caption aligncenter\"><a href=\"https:\/\/www.ductileironsuppliers.com\/wp-content\/uploads\/2025\/04\/What-is-the-C-value-of-Ductile-iron-pipe.webp\"><img fetchpriority=\"high\" decoding=\"async\" class=\"wp-image-1532 size-full\" src=\"https:\/\/www.ductileironsuppliers.com\/wp-content\/uploads\/2025\/04\/What-is-the-C-value-of-Ductile-iron-pipe.webp\" alt=\"What is the C value of Ductile iron pipe\" width=\"848\" height=\"634\" srcset=\"https:\/\/www.ductileironsuppliers.com\/wp-content\/uploads\/2025\/04\/What-is-the-C-value-of-Ductile-iron-pipe.webp 848w, https:\/\/www.ductileironsuppliers.com\/wp-content\/uploads\/2025\/04\/What-is-the-C-value-of-Ductile-iron-pipe-300x224.webp 300w, https:\/\/www.ductileironsuppliers.com\/wp-content\/uploads\/2025\/04\/What-is-the-C-value-of-Ductile-iron-pipe-768x574.webp 768w\" sizes=\"(max-width: 848px) 100vw, 848px\" \/><\/a><figcaption id=\"caption-attachment-1532\" class=\"wp-caption-text\">What is the C value of Ductile iron pipe<\/figcaption><\/figure>\n<h3 data-start=\"738\" data-end=\"777\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Ductile Iron Pipes and Their C Value<\/h3>\n<h4 data-start=\"779\" data-end=\"821\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Typical Ranges and Influencing Factors<\/h4>\n<p class=\"\" data-start=\"823\" data-end=\"886\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">For <a href=\"https:\/\/www.ductileironsuppliers.com\/products\/ductile-iron-pipes\">ductile iron pipes<\/a>, the C value depends on factors such as:<\/p>\n<ul data-start=\"887\" data-end=\"1309\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<li class=\"\" data-start=\"887\" data-end=\"1054\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<p class=\"\" data-start=\"889\" data-end=\"1054\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\"><strong data-start=\"889\" data-end=\"909\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">Internal Lining:<\/strong> Many ductile iron pipes are lined internally with a cement mortar or epoxy coating. A smooth, new cement mortar lining can increase the C value.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1055\" data-end=\"1163\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<p class=\"\" data-start=\"1057\" data-end=\"1163\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\"><strong data-start=\"1057\" data-end=\"1076\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">Aging and Wear:<\/strong> With time, corrosion, deposition, or mechanical wear may reduce the effective C value.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1164\" data-end=\"1309\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<p class=\"\" data-start=\"1166\" data-end=\"1309\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\"><strong data-start=\"1166\" data-end=\"1192\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">Manufacturing Quality:<\/strong> The quality of the casting and nodulizing process can affect the intrinsic roughness of the pipe\u2019s interior surface.<\/p>\n<\/li>\n<\/ul>\n<p class=\"\" data-start=\"1311\" data-end=\"1330\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\"><strong data-start=\"1311\" data-end=\"1330\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Typical Ranges:<\/strong><\/p>\n<ul data-start=\"1331\" data-end=\"1759\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<li class=\"\" data-start=\"1331\" data-end=\"1481\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<p class=\"\" data-start=\"1333\" data-end=\"1481\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\"><strong data-start=\"1333\" data-end=\"1369\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">New, Unlined Ductile Iron Pipes:<\/strong><br data-start=\"1369\" data-end=\"1372\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" \/>For a new ductile iron pipe without additional lining, the C value is often taken as approximately <strong data-start=\"1473\" data-end=\"1480\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">130<\/strong>.<\/p>\n<\/li>\n<li class=\"\" data-start=\"1482\" data-end=\"1759\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<p class=\"\" data-start=\"1484\" data-end=\"1759\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\"><strong data-start=\"1484\" data-end=\"1527\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Cement Mortar\u2013Lined Ductile Iron Pipes:<\/strong><br data-start=\"1527\" data-end=\"1530\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" \/>When ductile iron pipes are lined with a high-quality cement mortar, they may exhibit a slightly higher C value, often in the range of <strong data-start=\"1667\" data-end=\"1681\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">130 to 140<\/strong> (some sources even quote values around 140\u2013150 for very smooth, new linings).<\/p>\n<\/li>\n<\/ul>\n<p class=\"\" data-start=\"1761\" data-end=\"2014\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">These typical values are based on guidelines from various water supply and hydraulic engineering standards. In practice, engineers select a C value within this range based on the expected pipe age, maintenance history, and specific project requirements.<\/p>\n<h3 data-start=\"2021\" data-end=\"2067\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Comparison Table: Ductile Iron Pipe C Value<\/h3>\n<p class=\"\" data-start=\"2069\" data-end=\"2171\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Below is a table summarizing typical C value ranges for ductile iron pipes under different conditions:<\/p>\n<div class=\"pointer-events-none relative left-[50%]! flex w-[100cqw] translate-x-[-50%] justify-center *:pointer-events-auto\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<div class=\"tableContainer horzScrollShadows\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<table class=\"min-w-full\" data-start=\"2173\" data-end=\"3035\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<thead data-start=\"2173\" data-end=\"2314\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<tr data-start=\"2173\" data-end=\"2314\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<th data-start=\"2173\" data-end=\"2219\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\"><strong data-start=\"2175\" data-end=\"2188\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Pipe Type<\/strong><\/th>\n<th data-start=\"2219\" data-end=\"2247\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\"><strong data-start=\"2221\" data-end=\"2246\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Typical C Value Range<\/strong><\/th>\n<th data-start=\"2247\" data-end=\"2314\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\"><strong data-start=\"2249\" data-end=\"2258\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Notes<\/strong><\/th>\n<\/tr>\n<\/thead>\n<tbody data-start=\"2457\" data-end=\"3035\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<tr data-start=\"2457\" data-end=\"2598\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"2457\" data-end=\"2503\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">New, Unlined Ductile Iron Pipe<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"2503\" data-end=\"2531\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">125 \u2013 130<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)] min-w-[calc(var(--thread-content-max-width)\/3)]\" data-start=\"2531\" data-end=\"2598\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Standard roughness of freshly cast ductile iron without lining.<\/td>\n<\/tr>\n<tr data-start=\"2599\" data-end=\"2742\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)] min-w-[calc(var(--thread-content-max-width)\/3)]\" data-start=\"2599\" data-end=\"2647\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">New Cement Mortar\u2013Lined Ductile Iron Pipe<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"2647\" data-end=\"2675\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">130 \u2013 140<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)] min-w-[calc(var(--thread-content-max-width)\/3)]\" data-start=\"2675\" data-end=\"2742\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Smooth internal lining leads to reduced friction losses.<\/td>\n<\/tr>\n<tr data-start=\"2743\" data-end=\"2887\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)] min-w-[calc(var(--thread-content-max-width)\/3)]\" data-start=\"2743\" data-end=\"2791\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Aged\/Well-Used Ductile Iron Pipe (Unlined)<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"2791\" data-end=\"2819\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">120 \u2013 125<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)] min-w-[calc(var(--thread-content-max-width)\/3)]\" data-start=\"2819\" data-end=\"2887\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Surface roughness increases over time due to wear and deposits.<\/td>\n<\/tr>\n<tr data-start=\"2888\" data-end=\"3035\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)] min-w-[calc(var(--thread-content-max-width)\/3)]\" data-start=\"2888\" data-end=\"2938\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Aged Cement Mortar\u2013Lined Ductile Iron Pipe<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)]\" data-start=\"2938\" data-end=\"2966\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">125 \u2013 135<\/td>\n<td class=\"max-w-[calc(var(--thread-content-max-width)*2\/3)] min-w-[calc(var(--thread-content-max-width)\/3)]\" data-start=\"2966\" data-end=\"3035\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Some decline in smoothness may occur as the lining deteriorates.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n<\/div>\n<p class=\"\" data-start=\"3037\" data-end=\"3198\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\"><em data-start=\"3037\" data-end=\"3044\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\">Note:<\/em> These ranges are approximate. Actual values may vary with specific pipe conditions, regional practices, and the exact composition of the lining or alloy.<\/p>\n<h3 data-start=\"3205\" data-end=\"3254\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">How the C Value Impacts Hydraulic Calculations<\/h3>\n<p class=\"\" data-start=\"3256\" data-end=\"3666\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">When using the Hazen\u2013Williams equation, the C value directly influences the estimated head loss due to friction along the pipe. For example, higher C values (indicating smoother pipes) yield lower calculated head losses, which can result in more efficient water transmission. Selecting the appropriate value is critical for system design, ensuring that pumps and other hydraulic components are correctly sized.<\/p>\n<p class=\"\" data-start=\"3668\" data-end=\"4028\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\"><em data-start=\"3668\" data-end=\"3695\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Hydraulic design example:<\/em><br data-start=\"3695\" data-end=\"3698\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" \/>If you are comparing two systems \u2013 one using new cement-mortar-lined ductile iron pipes with a C value of 135 and another using aged unlined pipes with a C value of 120 \u2013 the system with the higher C value will have lower friction loss. This can influence decisions on pipe sizing, pumping energy, and overall infrastructure cost.<\/p>\n<p class=\"\" data-start=\"4050\" data-end=\"4428\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">The C value (Hazen\u2013Williams coefficient) is a key parameter in hydraulic design that represents the interior smoothness of a pipe. For ductile iron pipes, typical C values range from about 125\u2013130 for new, unlined pipes to approximately 130\u2013140 (or sometimes even up to 150) for new cement mortar\u2013lined pipes. Over time, the effective C value may decrease due to aging and wear.<\/p>\n<p class=\"\" data-start=\"4430\" data-end=\"4662\" data-immersive-translate-walked=\"2035c2e3-3be3-4579-8373-7aef5da7ef41\" data-immersive-translate-paragraph=\"1\">Understanding these values is essential for engineers and project planners to accurately model friction losses, size equipment appropriately, and ensure efficient, cost-effective water distribution and other fluid transport systems.<\/p>\n<h3>References:<\/h3>\n<ul>\n<li><a href=\"https:\/\/en.wikipedia.org\/wiki\/Hazen%E2%80%93Williams_equation\" target=\"_blank\" rel=\"nofollow noopener\">Hazen\u2013Williams Equation &#8211; Wikipedia<\/a><\/li>\n<li><a href=\"https:\/\/www.awwa.org\/Portals\/0\/AWWA\/Development\/Resources\/hazenwilliamsequation.pdf\" target=\"_blank\" rel=\"nofollow noopener\">American Water Works Association (AWWA) &#8211; Hazen\u2013Williams Equation Technical Guide<\/a><\/li>\n<li><a href=\"https:\/\/www.epa.gov\/sites\/default\/files\/2015-09\/documents\/pipe_friction_factors.pdf\" target=\"_blank\" rel=\"nofollow noopener\">U.S. Environmental Protection Agency &#8211; Pipe Roughness and Friction Factors for Hydraulic Design<\/a><\/li>\n<li><a href=\"https:\/\/www.engineeringtoolbox.com\/hazen-williams-water-d_797.html\" target=\"_blank\" rel=\"nofollow noopener\">Engineering Toolbox &#8211; Hazen-Williams Roughness Coefficients for Various Pipes<\/a><\/li>\n<li><a href=\"https:\/\/www.waterrf.org\/research\/projects\/pipe-hydraulics-and-hydrology\" target=\"_blank\" rel=\"nofollow noopener\">Water Research Foundation &#8211; Pipe Hydraulics and Roughness Coefficient Studies<\/a><\/li>\n<\/ul>\n","protected":false},"excerpt":{"rendered":"<p>In hydraulic engineering, the \u201cC value\u201d refers to the Hazen\u2013Williams roughness coefficient. This dimensionless number is widely used to estimate friction losses (head loss) in water flow calculations, particularly in the Hazen\u2013Williams formula. The C value indicates the efficiency with which water flows through a pipe \u2013 a higher value denotes a smoother interior surface, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":1532,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"default","adv-header-id-meta":"","stick-header-meta":"default","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"set","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[1],"tags":[],"class_list":["post-1531","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-news"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.7 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is the C value of Ductile iron pipe - Jingang LuoKaiwei<\/title>\n<meta name=\"description\" content=\"For ductile iron pipes, typical C values range from about 125\u2013130 for new, unlined pipes to approximately 130\u2013140 (or sometimes even up to 150) for new cement mortar\u2013lined pipes.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" 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